Abstract
A RARE abnormality in the arterial system of the common frog was found in a male specimen from Cornwall. The fifth aortic arch persisted on both sides of the animal and was patent. Carotid, systemic and pulmo-cutaneous arches were normal ; but the fifth arch branched off from the pulmo-cutaneous. It joined the systemic arch laterally and was large and open. Right and left sides were symmetrical. A ligamentum aortico-carotideum was present. The relation of the posterior petro-hyoideus muscles was as follows. The internal carotid artery slipped beneath, that is, dorsal to, the first petro-hyoid muscle, the systemic arch dorsal to the second, and the abnormally persistent arch dorsal to the third, thus preserving the regularity of arrangement which is lost when the fifth arch disappears during development.
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Anat. Anz., 75, No. 21/22 (1933).
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EALES, N. Persistent Fifth Arterial Arch in the Frog. Nature 163, 648 (1949). https://doi.org/10.1038/163648b0
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DOI: https://doi.org/10.1038/163648b0
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